/**
 * @param {string} target
 * @return {string}
 */
var alphabetBoardPath = function (target) {
  var result = '';
  var board = ["abcde", "fghij", "klmno", "pqrst", "uvwxy", "z"]
  var length = target.length;
  var currentX = 0;
  var currentY = 0;
  for (var i = 0; i < length; i  ) {
    for (var j = 0; j < board.length; j  ) {
      if (board[j].indexOf(target[i]) > -1) {
        var tempY = j;
        var tempX = board[j].indexOf(target[i]);
        if (currentX == tempX && currentY == tempY) {
          result  = '!';
        } else {
          if (currentX == 0 && currentY == 5) {
            var diffY = tempY - currentY;
            if (diffY > 0) {
              for (var p = 0; p < diffY; p  ) {
                result  = 'D'
              }
            } else {
              for (var p = 0; p < Math.abs(diffY); p  ) {
                result  = 'U'
              }
            }
            var diffX = tempX - currentX;
            if (diffX > 0) {
              for (var p = 0; p < diffX; p  ) {
                result  = 'R'
              }
            } else {
              for (var p = 0; p < Math.abs(diffX); p  ) {
                result  = 'L'
              }
            }
          } else {
            var diffX = tempX - currentX;
            if (diffX > 0) {
              for (var p = 0; p < diffX; p  ) {
                result  = 'R'
              }
            } else {
              for (var p = 0; p < Math.abs(diffX); p  ) {
                result  = 'L'
              }
            }
            var diffY = tempY - currentY;
            if (diffY > 0) {
              for (var p = 0; p < diffY; p  ) {
                result  = 'D'
              }
            } else {
              for (var p = 0; p < Math.abs(diffY); p  ) {
                result  = 'U'
              }
            }
          }
          result  = '!';
        }
        currentX = tempX;
        currentY = tempY;
      }
    }
  }
  return result;
};

console.log(alphabetBoardPath('zb'));